Adjustable ramp helix

ABSTRACT

An adjustable ramp helix is disclosed for attachment to the clutch of a snowmobile or other vehicle. The adjustable ramp helix may include a base having a throat. Extending upwardly from the base opposite to the throat may be three equally sized ramp supports where each ramp support has an adjustable ramp. Each adjustable ramp is preferably pivotally attached to the top portion of a corresponding ramp support for positioning to the interior thereof. Each of the adjustable ramps includes an arcuate foot section which passes through an arcuate aperture in the base. A threaded outer dial collar may be rotatably engaged to the throat for positioning with respect to the collar. The collar engages the arcuate foot sections of the adjustable ramps to uniformly and simultaneously elevate the adjustable ramps above the ramp supports. The elevation of the adjustable ramps provides a new angle for the bushing faces for engagement to the clutch of a vehicle to establish an alternative speed of shifting for a snowmobile or other engine. An operator may thereby adjust the speed of shifting for a snowmobile or other vehicle without disassembly of the clutch and replacement of the helix during use in high altitude, varying snow, or changing temperature conditions.

BACKGROUND OF THE INVENTION

[0001] Snowmobile clutch and transmission systems as known are notversatile to provide maximum performance in varying conditions asrelated to altitude, snow depth, and/or temperature. As such, optimalshifting performance for the snowmobile has not been obtained becausesnowmobile transmissions frequently shift gears early or late, therebyadversely affecting the performance of the sled.

[0002] In the past, to attempt to minimize shifting problems asnowmobile operator purchased a number of helix devices, where eachdifferent helix device had inclined ramps of a desired set angle. Thehelix devices when engaged to a clutch, provided a desired speed ofshifting of the gears of the snowmobile or other vehicle. Theseindependent helix devices allowed an operator to disassemble the clutchto replace the helix for operation within varying altitude, snow, andtemperature conditions, to attempt to maximize the performance of thesnowmobile clutch and snowmobile.

[0003] In the past, operators have frequently expended significantperiods of time, which may have been in excess of one hour or more, incold weather conditions, tearing down and reassembling a snowmobileclutch for replacement with a helix having a desired angle of inclinefor the stationary ramps in anticipation of future weather, temperature,and/or altitude conditions. Operators were thereby required to predictweather and snow conditions which frequently resulted in the failure toselect the optimal helix for use in the anticipated conditions. Inaddition, changes in weather during a day often necessitated thechanging of a helix to optimize sled or vehicle performance. Further,changes in altitude during a day or trip also necessitated a change orreplacement of a helix to optimize snowmobile or vehicle performance.

[0004] Significant time and expense is required to replace a helix forthe clutch of a vehicle. It is also inconvenient to carry a number ofhelixes during a snowmobile trip for replacement to accommodate varyingaltitude, snow, and/or temperature conditions. A need therefore existsto provide an adjustable ramp helix which may be easily and convenientlymodified to minimize maintenance and down time for a vehicle. Differingsnow and temperature conditions also affect the transmission of asnowmobile as to how fast or how slow the shifting of the gears shouldoccur. It is difficult to carry within a snowmobile glove box the toolsand replacement helixes necessary to disassemble and replace the helixfor a clutch during snowmobiling activities.

GENERAL DESCRIPTION OF THE INVENTION

[0005] This application is based upon and claims priority to co-pendingU.S. Provisional Patent Application No. 60/122,520 filed Mar. 3, 1999,which is incorporated herein by reference.

[0006] An adjustable ramp helix is disclosed for attachment to theclutch of a snowmobile or other vehicle. The adjustable ramp helix mayinclude a base having a throat having threaded and non-threadedsection's . Extending outwardly from the base opposite to the throat maybe three equally sized ramp supports where each ramp support has anadjustable ramp. The adjustable ramps may be pivotally attached to thetop portion of each of the ramp supports for positioning to the interiorthereof. Each of the adjustable ramps preferably includes an arcuatefoot section which passes through an arcuate aperture in the base. Anelevator or outer dial collar may be rotatably engaged to the threadedsection of the throat for positioning with respect to the base. Theelevator or collar engages the arcuate foot sections of the adjustableramps to uniformly and simultaneously elevate the adjustable ramps abovethe production ramp supports to provide a desired ramp angle forengagement to the vehicle clutch. A modified shift speed for thesnowmobile or other engine is thereby provided. An operator may adjustthe shift speed for a snowmobile or other vehicle without disassembly ofthe clutch and replacement of the helix during use in high altitude,varying snow, or changing temperature conditions. An operator mayposition the elevator or rotate the outer dial collar to elevate orlower the feet and adjustable ramps to alter the angle of incline forthe adjustable ramps either upwardly or downwardly. This elevation orlowering of the angle of incline for the adjustable ramps alters therate or speed at which the clutch shifts into a different gear duringuse of the snowmobile or vehicle.

[0007] An advantage of the present invention is the provision of anadjustable ramp helix of relatively simple and inexpensive design,construction, and operation which provides adjustable shifting ratioswithout fear of injury to persons and/or damage to the transmission of asnowmobile.

[0008] Another advantage of the present invention is the provision of anadjustable ramp helix which may be easily and conveniently manipulatedto maximize performance of a snowmobile clutch within varying snowconditions.

[0009] Still another advantage of the present invention is the provisionof an adjustable ramp helix which may be easily and convenientlymanipulated to maximize performance of a snowmobile clutch withinvarying temperature conditions.

[0010] Still another advantage of the present invention is the provisionof an adjustable ramp helix which may be easily and convenientlymanipulated to maximize performance of a snowmobile clutch withinvarying altitude conditions.

[0011] Still another advantage of the present invention is the provisionof an adjustable ramp helix which minimizes maintenance or down timewhen an operator desires to modify the angle of incline for theadjustable ramps and thereby alter the speed of the shifting of thesnowmobile transmission during use of a snowmobile.

[0012] Still another advantage of the present invention is the provisionof adjustable ramps which maximize enjoyment and minimizes frustrationof a snowmobile operator during use of a snowmobile.

[0013] Still another advantage of the present invention is the provisionof adjustable ramps which provide a ramp incline angle of between 20°and 80° within a single helix.

[0014] Still another advantage of the present invention is the provisionof adjustable ramps which may accommodate uniformly horizontally arcuateramps or variable inclined ramps at the discretion of an individual.

[0015] Still another advantage of the present invention is the provisionof adjustable ramps which permit the simultaneous selection of variableangles of incline for the adjustable ramps without the necessity tocontinuously replace the helix as used on a snowmobile.

[0016] A feature of the present invention is the provision of anadjustable ramp helix having a base having a throat having threaded andnon-threaded sections and an elevator or outer dial collar which permitsan individual to easily select and simultaneously adjust the incline ofthe adjustable ramps of the helix as engaged to the clutch for shiftingof the gears of a snowmobile.

[0017] Another feature of the present invention is the provision of anadjustable ramp helix attached to the clutch of a snowmobile whicheliminates the necessity to disassemble the clutch and replace the helixto alter the speed of shifting of the sled during use.

[0018] Still another feature of the present invention is the provisionof an adjustable ramp helix having three uniformly spaced and sized rampsupports where each ramp support includes a preselected stationary angleof incline which is identical to the initial angle of incline of theadjustable ramps.

[0019] Still another feature of the present invention is the provisionof an adjustable ramp helix having adjustable ramps pivotally attachedto the top portion of each of the ramp supports.

[0020] Still another feature of the present invention is the provisionof an adjustable ramp helix having adjustable ramps positioned to theinterior of the ramp supports.

[0021] Still another feature of the present invention is the provisionof adjustable ramps each having an arcuate foot section adapted forengagement to the elevator or outer dial collar for simultaneouslyaltering the angle of incline of the adjustable ramps relative to theramp supports during positioning of the elevator or rotation of theouter dial collar.

[0022] Still another feature of the present invention is the provisionof an adjustable ramp helix having a base having three uniformly spacedand sized arcuate shaped cutout apertures adapted to each receive anarcuate foot of a corresponding adjustable ramp.

[0023] Still another feature of the present invention is the provisionof an adjustable ramp helix where each arcuate foot has a bottom havinga first flat surface, a second incline surface, and a transition point,where the arcuate foot is adapted to engage the elevator or outer dialcollar during positioning of the elevator or rotation of the outer dialcollar to adjust the angle of incline of the adjustable ramps relativeto the ramp supports during use of a snowmobile.

[0024] Still another feature of the present invention is the provisionof an adjustable ramp helix where three adjustable ramps aresimultaneously and uniformly elevated relative to the adjacent rampsupports for engagement to a clutch to establish a desired rate ofshifting for a snowmobile without disassembly of the clutch andreplacement of the helix during use in high altitude, varying snow,and/or changing temperature conditions.

DESCRIPTION OF THE DRAWINGS

[0025]FIG. 1 is an environmental view of a snowmobile and clutchmechanisms;

[0026]FIG. 2 is an exploded side view of the adjustable helix as engagedto the driven or secondary clutch;

[0027]FIG. 3 is a top view of the adjustable helix taken along the lineof 3-3 of FIG. 2;

[0028]FIG. 4 is a top view of the hub of the driven or secondary clutchtaken along the line of 4-4 of FIG. 2;

[0029]FIG. 5 is a detailed side view of the adjustable helix as engagedto the driven or secondary clutch during operation of a snowmobile;

[0030]FIG. 6 is an isometric detail view of the adjustable helix;

[0031]FIG. 7 is a side view of the adjustable helix;

[0032]FIG. 8 is a detailed cross-sectional side view of the adjustablehelix taken along the line of 8-8 of FIG. 3;

[0033]FIG. 9 is an alternative embodiment of the adjustable helix asengaged to the driven or secondary clutch 12;

[0034]FIG. 10 is a cross-sectional top view of the alternativeadjustable helix taken along the line of 10-10 of FIG. 9;

[0035]FIG. 11 is an isometric view of an alternative embodiment of theadjustable helix;

[0036]FIG. 11A is a detail view of an alternative embodiment of anadjustable ramp;

[0037]FIG. 12A is a detailed side view of a variable adjustable ramp;

[0038]FIG. 12B is an alternative detail side view of a variableadjustable ramp;

[0039]FIG. 12C is an alternative detail side view of a variableadjustable ramp;

[0040]FIG. 12D is an alternative detail side view of a variableadjustable ramp;

[0041]FIG. 13 is an alternative side partial cutaway view of anadjustable helix;

[0042]FIG. 14 is an alternative detail cross-sectional view of thecollar and throat taken along the line of 14-14 of FIG. 13;

[0043]FIG. 15 is an alternative side view of the adjustable helix;

[0044]FIG. 16 is an alternative detail cross-sectional view of thecollar and throat taken along the line of 16-16 of FIG. 15; and

[0045]FIG. 17 is a detail cross-sectional side view of the aperturetaken along the line of 17-17 of FIG. 13.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] An adjustable ramp helix is illustrated and described herein. Theadjustable ramp helix is generally referred to by the numeral 10. Asseen in FIG. 1, the adjustable ramp helix 10 is preferably engaged tothe driven or secondary clutch 12 of a snowmobile 14. The driven orsecondary clutch 12 preferably includes a pair of sheaves 16 which areengaged to a V-belt 18. The V-belt 18 is further engaged to a frontclutch 20 having a pair of sheaves 22. The sheaves 22 are preferablyengaged to the engine 24 via a shaft not shown.

[0047] As may be seen in FIG. 1, the adjustable helix 10 is preferablyengaged to the exterior of the driven or secondary clutch 12 and ispositioned below the clutch and belt guard 26 of the snowmobile. Anindividual may therefore obtain access to the adjustable ramp helix 10by lifting the clutch and belt guard 26 as is apparent in FIG. 1.

[0048] As is seen in FIG. 1, when the snowmobile 14 is in neutral, theV-belt 18 is positioned outwardly and is adjacent to the exteriorcircumference of the sheaves 16 of the driven or secondary clutch 12.During operation of the snowmobile 14, as power is applied to the engine24, throw weights which are integral to the drive clutch 20 act tosqueeze the sheaves 22 toward each other as depicted by arrows 28. Thesqueezing of the sheaves 22 of the drive clutch 20 in turn move theV-belt 18 outwardly toward the exterior circumference of the sheaves 22of the drive clutch 20. The movement of the V-belt 18 outwardly relativeto the sheaves 22 in turn causes the V-belt 18 to be drawn inwardlyrelative to the sheaves 16 of the driven or secondary clutch 12. Thesheaves 16 of the driven or secondary clutch 12 then separate asdepicted by arrows 30. The separation of the sheaves 16 outwardly asidentified by arrow 30 in turn causes bushings 32 to engage theadjustable ramps 70 to move bushings 32 upwardly along the adjustableramps 70 to shift gears for the snowmobile 14 (FIGS. 1, 2, and 4).

[0049] The production incline for the helix assists in determining thespeed of shifting for the snowmobile engine 24.

[0050] The incline of the helix is important for the selection of thespeed of shifting for the snowmobile 14. An increase or decrease of theincline of the helix results in corresponding changes to the shift speedfor snowmobile 14. Generally, the incline for the helix varies atincrements of 2°between 20° and 80° upwardly from horizontal. Theincline of the helix determines how fast the transmission of thesnowmobile 14 shifts gears. At lower elevations or flatter terrains,steeper angles of incline are desired for the helix. At higherelevations or steeper terrains, lower angles of incline for the helixare preferred. In general, at a lower elevation of between 0 to 4,000feet above sea level an incline for the helix of approximately 50°upwardly from horizontal is desired. At an elevation between 4,000 and8,000 feet the preferred desired incline for the helix is approximately47.5° upward from horizontal. At elevations between 8,000 to 12,000 feetthe preferred angle of incline for the helix is approximately 450upwardly from horizontal. It should be noted that the angles of inclinedescribed herein have been provided for illustrative purposes only andmay vary considerably at the discretion of an individual. It should alsobe noted that the elevation above sea level is not the only factor forselection of an angle of incline for the helix. If a snowmobile is to beused in very hilly terrains, then an individual may desire that a lowerangle of incline be provided for the helix. Also, it should be notedthat the snow conditions and temperature also are factors to considerwhen selecting a desired angle of incline for a helix.

[0051] During use of the snowmobile 14, the bushings 32 are continuallyriding upwardly and downwardly along the incline of the adjustable ramps70 based upon the level of throttle selected by the snowmobile operator.During use of the snowmobile 14 on steep hills, it is desirable that theangle of incline of the adjustable ramps 70 be relatively flat tofacilitate slower shifting of the gears to avoid the engine 24 frombecoming bogged down. An operator may thereby easily maintain a higherlevel of RPM for the engine 24. On more even terrain, it is desirable tohave a relatively steep incline for the adjustable ramps 70 tofacilitate a faster shifting of the transmission to maintain maximumperformance and RPM's for the snowmobile engine 24.

[0052] During use of a snowmobile 14 in mountainous regions, the angleof incline for the adjustable ramps 70 is preferably higher at lowerelevations where a snowmobile engine 24 typically has more power. Athigher altitudes, a snowmobile engine 24 typically has 35% lesshorsepower; therefore, the angle of incline for the adjustable ramps 70is required to be less steep to facilitate slower shifting of thetransmission. If no change is made to the angle of incline for theadjustable ramps 70 between varying altitude conditions, the snowmobiletransmission and driven or secondary clutch 12 will shift even if thepower for the engine 24 is unavailable, resulting in the engine boggingdown causing frustration to an operator. A steeper angle of incline forthe adjustable ramps 70 typically results in faster shifting by thetransmission which in turn increases the difficulty to hold a desiredRPM for the engine 24, in turn increasing the possibility of thesnowmobile 14 becoming stuck in deep snow. The flatter or lower of theangle of incline for the adjustable ramps 70, the slower thetransmission will shift up a gear and the faster the transmission willdownshift. For running in deep snow, a snowmobile engine 24 frequentlyneeds to quickly back shift; therefore, a flatter angle of incline forthe adjustable ramps 70 is desired. The steeper the incline for theadjustable ramps 70, the faster the snowmobile engine 24 shifts up agear and the slower the engine 24 back shifts and vice versa. Whenoperating in high altitude conditions, it is desirable to quicklydownshift in order to maintain a desired level of RPM's for the engine.

[0053] In general, the driven or secondary clutch 12 includes a hub 36.Extending upwardly from the hub 36 are preferably three bushing chairs38. Each bushing chair 38 preferably includes a bushing 32 which engagesthe adjustable ramps 70. The bushing chairs 38 are preferably uniformlyspaced about the circumference of a circle within the interior of thehub 36. The hub 36 surrounds the shaft 48 and spring 50 of thesnowmobile 14 (FIGS. 2 and 4).

[0054] Three clutch pillars 40 also preferably extend upwardly from thehub 36. Each clutch pillar 40 preferably has a threaded post 42 which isadapted to engage a nut 44 which in turn is used to attach theadjustable helix 10 to the hub 36. The clutch pillars 40 are preferablyuniformly and regularly spaced about the circumference of the hub 36.

[0055] Three spring retainers 46 are preferably regularly and uniformlyspaced about the hub 36 exterior to the shaft 48. Each of the springretainers 46 is preferably adapted to receive a first affixation tab ofthe spring 50 to prevent rotation of the spring 50 relative to the hub36. The spring 50 is preferably a torsion spring having any desired coilstrength as preferred by an individual. The spring 50 is preferablyengaged to the hub 36 and adjustable ramp helix 10 to prevent snappingor slapping of the helix 10 following shifting of the transmission forthe snowmobile 14. It should also be noted that the spring 50 preferablyregulates the speed of shifting of the transmission of the snowmobile 14during use. The plurality of spring retainers 46 within the hub 36enable varying tensions to be selected for placement on the spring 50during assembly and affixation of the adjustable ramp helix 10 to thedriven or secondary clutch 12. Generally, the spring 50 as engaged tothe hub 36, is rotated and/or compressed one-third turn duringaffixation of the adjustable ramp helix 19 to the clutch pillars 40.

[0056] As seen in FIG. 2, the adjustable ramp helix 10 is formed of abase 54. Extending outwardly from the base 54 is preferably a throat 56which is preferably adapted to receivingly engage an elevator or outerdial collar 58. The throat 56 may have a threaded section 57. Theelevator or outer dial collar 58 may completely or partially surroundthe throat 56. The base 54 also preferably includes three regularlyspaced and 20 equally sized affixation ledges 60. Adjacent eachaffixation ledge 60 is preferably a cut-away channel 62. Each affixationledge 60 preferably includes an aperture 64 therethrough (FIGS. 3 and6). Each affixation ledge 60, cut-away channel 62, and aperture 64 ispreferably adapted to receivingly engage a threaded post 42 foraffixation of the adjustable helix 10 to the driven or secondary clutch12.

[0057] Each affixation ledge 60 may also include a positioning wall 61which is preferably adapted to be placed to the interior of, andadjacent to, the top of a corresponding clutch pillar 40 duringengagement of the adjustable ramp helix 10 to the driven or secondaryclutch 12. The vertical rear edges 82 of the ramp supports 72 arepreferably adapted for positioning adjacent to a corresponding verticaledge 84 of a corresponding clutch pillar 40. The cut-away channels 62are also preferably sized to receivingly permit rotation of a nut 44during secure affixation of the adjustable helix 10 to the driven orsecondary clutch 12.

[0058] Extending outwardly from the threaded section 57 of the throat 56is preferably a non-threaded surface 132. The non-threaded surface 132is preferably utilized as an area to provide releasable affixationbetween the outer dial collar 58 and the throat 56 following elevationor lowering of the adjustable ramps 70 to a desired angle relative tothe ramp supports 72. The use of the non-threaded surface 132 preferablyminimizes risk of damage to the threaded section 57 of the throat 56during affixation of the outer dial collar 58 at a desired rotationalposition relative to the throat 56 during use of the adjustable helix10. (FIGS. 15 and 16.)

[0059] The non-threaded surface 132 may include a plurality of regularlyspaced recessed grooves 134. The recessed grooves 134 may be regularlyspaced along the non-threaded surface 132 to provide for elevationand/or lowering of the angle of incline of the adjustable ramps 70relative to the ramp supports 72 at any increment as desired by anindividual. It is anticipated that the desired spacing of the recessedgrooves 134 about the non-threaded surface 132 provides elevation and/ordecent of the adjustable ramps 70 at 2° increments relative to the rampsupports 72. Alternatively, the non-threaded surface 132 may contain aplurality of retaining recesses. The retaining recesses, like thelongitudinally extending recessed grooves 134 are preferably adapted toreceive a positioner 165 which is used to secure the outer dial collar58 at a desired rotational position relative to the throat 56. Theretaining recesses are also preferably regularly spaced along thenon-threaded surface 132 to provide for elevation and/or lowering of theangle of incline for the adjustable ramps 70 relative to the rampsupports 72 at any increment as desired by an individual. It isanticipated that the spacing of the retaining recesses about thenon-threaded surface 132 provides for elevation and/or decent of theadjustable ramps 70 at 2° increments relative to the ramp supports 72.

[0060] The retaining recesses or recessed grooves 134 may be regularlyspaced along the exterior of the non-threaded surface 56 in any desiredpattern and/or configuration as desired by an individual. It should benoted that the retaining recesses may be configured in an arcuate shapeand/or spiral along the non-threaded surface 132. It should also benoted that a plurality of patterns may be provided for the retainingrecesses and/or recessed grooves 134 about the non-threaded surface 132as desired by an individual. An individual may simultaneously userecessed grooves 134 and/or retaining recesses without sacrificing theessential functions, features, and attributes described herein.

[0061] In an alternative embodiment, the non-threaded surface 132 maynot include recessed grooves 134 and/or retaining recesses. In thisembodiment, the non-threaded surface 132 is adapted to receive thepositioner 165 through the use of compression which in turn may securethe outer dial collar 58 at a desired rotational position relative tothe throat 56. In this embodiment the positioner 165 may be a screwhaving a nylon end which may be utilized to releasably secure the outerdial collar 58 at a desired rotational location relative to the throat56, which in turn releasably secures the adjustable ramps 70 at adesired angle of incline relative to the ramp supports 72.

[0062] It is anticipated that the throat 56 will include an outwardlyextending non-threaded surface 132 which may be utilized for engagementto the positioner 165. Alternatively, the non-threaded surface 132 maybe eliminated from the throat 56 as described herein.

[0063] The outer dial collar 58 may include an interior surface 174. Inone embodiment a plurality of apertures 176 may traverse the outer dialcollar 58. The plurality of apertures 176 are preferably adapted to eachreceive a positioner 165 utilized to secure the outer dial collar 58 ata desired rotational position relative to the throat 56. The apertures176 may be further adapted to include a detente recess 168 proximate tothe interior surface 174. The apertures 176 and positioners 165 may beregularly spaced about the outer dial collar 58 to facilitate releasableengagement to the throat 56.

[0064] The positioners 165 may include detente balls 166, pins, or setscrews 122, at the preference of an individual. Alternative devices maybe used as the positioners 165 described herein provided that theessential functions, features, and attributes for the adjustable helix10 are not sacrificed.

[0065] Positioners 165 such as set screws 122 may traverse the exteriorsurface of the outer dial collar 58. Interior to the apertures 176 mayalso be positioned a spring 170 which may further engage a detente ball166 and/or pin. The rotation of the positioner 165, or set screw 122preferably compresses the spring 170 which, in turn, tightens thecontact between the detente ball 166 and/or pin to the non-threadedsurface 132. The positioner 165, or set screw 122 should not betightened to restrict rotation of the outer dial collar 58 relative tothe throat 56 until such time as the detente balls 166 and/or pins arealigned with the recessed grooves 134 and/or retaining recesses.Following mating engagement of the detente balls 166 within the recessedgrooves 134 or the insertion of the pins within the retaining recesses,the positioner 165, or set screw 122, may be further tightened toprevent inadvertent and/or undesirable rotation of the outer dial collar58 relative to the throat 56. To effectuate rotation of the outer dialcollar 58 relative to the throat 56 an individual may manipulate andrelease the positioner 165 and/or set screw 122 to remove tension fromthe compressed spring 170. The reduction of tension upon the spring 170permits the detente balls 166 and/or pins to separate from the recessedgrooves 134 and/or retaining recesses permitting rotation of the outerdial collar 58 relative to the throat 56.

[0066] It should be noted that the use of detente balls 166 and/or pinsmay be eliminated provided that the positioner 165 and/or set screw 122is of sufficient length for engagement to the throat 56 and preferablyto the non-threaded surface 132. Alternatively, the distal end of thepositioner 165 and/or set screw 122 may include a nylon engagement edgewhich may frictionally bind the non-threaded surface 132 restrictingrotation of the outer dial collar 58 relative to the throat 56. As notedabove, the apertures 176 may be threaded to receive a threadedpositioner 165 permitting rotation therebetween. In this embodiment thepositioner 165 or set screw 122 may have an elevated position whichpermits rotation of the outer dial collar 58 relative to the throat 56to an engaged position which secures the outer dial collar 58 to thethroat 56.

[0067] It should be noted that the use of a set screw 122 and/or othertightening device may be eliminated at the discretion of an individual.In this embodiment, the outer dial collar 58 may include a plurality ofregularly spaced detente and/or pin recesses 168. A cavity may beintegral to the base 54 to hold a spring 170 and a detente ball 166. Thedetente ball 166 and/or pin may be engaged to the distal end of thespring 170 for compression relative to the non-threaded surface 132. Thecompression of the spring 170 is preferably of a sufficient force tourge the detente balls 166 and/or pins outwardly for engagement withinthe pin recesses 168 to secure the outer dial collar 58 to the throat56.

[0068] Any desired affixation member may be utilized by an individualprovided that the releasable rotation of the outer dial collar 58relative to the throat 56 is provided herein.

[0069] The positioner 165 and/or set screws 122 may traverse the outersurface of the outer dial collar 58 to facilitate access by anindividual to permit rotation of the outer dial collar 58 relative tothe throat 56.

[0070] The regularly spaced recessed grooves 134 may also be adapted toreceive the detente balls 166. A spring 170 may be positioned proximateto each of the detente balls 166. The springs 170 preferably engage thedetente balls 166 to urge the detente balls 166 outwardly into theregularly spaced recessed grooves 134 to releasably secure the outerdial collar 58 at a desired rotational position relative to the threadedthroat 56. During rotation of the outer dial collar 58 relative to thethroat 56 it is anticipated that the springs 170 will expand urging thedetente balls 166 outwardly to ride upon the non-threaded surface 132until such time as positioning within another recessed groove 134becomes available.

[0071] The retaining recesses may be adapted to receive pins which areengaged to the outer dial collar 58. The pins are preferably positionedproximate to the interior surface 174 of the outer dial collar 58. Thepins may also be engaged to springs 170 which may be utilized to urgethe pins outwardly to engage the non-threaded surface 132 until suchtime as alignment with the retaining recesses becomes available forreleasable positioning of the outer dial collar 58 at a desiredrotational position relative to the throat 56.

[0072] The outer dial collar 58 preferably includes an outercircumference which may have recessed portions 178 which may be utilizedby an individual to facilitate grasping for rotation of the outer dialcollar 58 relative to the throat 56. Alternatively, the exterior surfaceof the outer dial collar 58 may include knurled sections 180 tofacilitate grasping by an individual for rotation of the outer dialcollar 58 relative to the throat 56.

[0073] Extending outwardly from the base 54 opposite to the throat 56are preferably three uniformly shaped and regularly spaced ramp supports72. Each of the ramp supports 72 include an aperture 68 therethroughadjacent to the top. An adjustable ramp 70 is preferably pivotallyengaged to each of the ramp supports 72.

[0074] A transition member 73 may be positioned between each adjustableramps 70 and the outer dial collar 58. The transition member 73 may be afoot 74 or a elevator pin 164. The transition member 73 preferablyprovides the mechanism for elevation of the adjustable ramps 70 relativeto the ramp supports 72 during use of the adjustable ramp helix 10.

[0075] Each adjustable ramp 70 may include a foot 74 having a first flatsurface 76, a second inclined surface 78, and a transition point 80between the first flat surface 76 and the second inclined surface 78.

[0076] The adjustable ramps 70 are preferably pivotally engaged to acorresponding ramp support 72 via a nut and bolt, pin, or set screwwhich is positioned within an aperture 68. A bushing 182 is preferablypositioned within the apertures 68 to facilitate pivotal interactionbetween the adjustable ramps 70 and the ramp supports 72. The bushings182 may be formed of any material as desired by an individual including,but not limited to, Teflon and/or plastics to reduce friction betweenthe nut, pin, or set screw and the aperture 68. The adjustable ramphelix 10 preferably includes three identically sized, spaced and shapedramp supports 72 having adjustable ramps 70 positioned about thecircumference of the adjustable ramp helix 10.

[0077] Referring to FIGS. 3, 5, 6, and 7, the base 54 of the adjustableramp helix preferably includes three identically shaped, sized, andregularly spaced arcuate or kidney shaped apertures 86 which areoversized relative to the feet 74 of the adjustable ramps 70. Eacharcuate or kidney shaped aperture 86 is preferably adapted to receive acorresponding foot 74 of a ramp support 70. The base 54 of theadjustable ramp helix 10 also preferably includes a plurality of springretainers 88 which are adapted to engage second tabs of the spring 50.The top view of the adjustable ramp helix 10 shows that each rampsupport 72 preferably includes a top shelf 92 and the aperture 68 whichis adapted to receive a nut and bolt, pin, or set screw 94 to pivotallyaffix the adjustable ramps 70 to the ramp supports 72. (FIGS. 3 and 6.)

[0078] As may be seen in FIG. 3, each ramp support 72 includes anadjustable ramp 70. Each ramp support 72 preferably has an arcuateexterior edge 96 and a substantially straight interior edge 98 as may beseen in FIG. 6. Each ramp support 72 also preferably has a bushing face184 which is preferably arcuate laterally or curved inwardly. Each rampsupport 72 is also simultaneously arcuate vertically, descendinginwardly and downwardly over a curve having a preselected shape from thetop shelf 92 to the base 54. As may be further seen from FIG. 6, theramp supports 72 have their widest width dimension proximate to the topshelf 92 and the smallest width dimension proximate to the base 54. Theshape selected for the adjustable ramps 70 and/or ramp supports 72, mayhave any rotational, twisting, and/or spiral incline as desired. Theangle of incline for the adjustable ramps 70 and/or ramp supports 72 mayvary between the base 54 and the portion of the ramp support 72proximate to the top shelf 92. As such, the angle of incline for theadjustable ramps 70 and/or ramp supports 72 may be consistently uniform,regularly curved, or variable at the discretion of an individual. (FIGS.7, 6, 12A-12D.)

[0079] In an alternative embodiment, the adjustable ramps 70 and/or rampsupports 72 may have a relatively smaller incremental increase ordecrease in the angle of incline adjacent to the base 54. Also, theadjustable ramps 70 and/or ramp supports 72 may have a larger or steeperincremental increase or decrease in the angle of incline adjacent to thetop shelves 92. The variable angle of incline of the adjustable ramps 70and/or ramp supports 72 is preferably in addition to the arcuateinterior curve for the shape of each adjustable ramp 70 and/or rampsupport 72.

[0080] The straight interior edges 98 of the ramp supports 72 preferablyrepresent a vertical wall which is perpendicular to the base 54. Thevertical wall of the ramp supports 72 are preferably of sufficientstrength to counter the outward centrifugal forces of the adjustableramps 70 during rotation of the driven or secondary clutch 12. Thevertical wall preferably supports the adjacent wall 100 to prevent orprohibit outward movement of the adjustable ramps 70 relative to theramp supports 72 due to centrifugal forces which are exposed to theadjustable helix 10 during rotation of the driven or secondary clutch 12during use of a snowmobile 14.

[0081] The adjustable ramps 70 preferably include a straight adjacentwall or edge 100 which is another substantially vertical wall positionedadjacent to the straight interior edge 98 of a corresponding rampsupport 72. As may be seen in FIGS. 6 and 7, the straight interior edge98 and the straight adjacent wall or edge 100 are not arcuate laterallyto coincide with the arcuate shape of the combined ramp supports 72 andadjustable ramps 70. The straight interior edge 98 and the straightadjacent wall or edge 100 preferably traverses the overall arcuate shapeof the ramp supports 72 along a straight line. The straight interioredge 98 and straight adjacent wall or edge 100 preferably initiateproximate to the top shelf 92 of the ramp supports 72 and the top shelf102 of the adjustable ramps 70 extending downwardly in a straight linecrossing the arcuate shape of the ramp supports 72 toward the base 54.The straight interior edge 98 and the straight adjacent wall or edge 100preferably terminate proximate to the base 54 defining the leading edge106 and the horizontal shelf 120. The horizontal shelves 120 are theunderside of the adjustable ramps 70 which are adapted for flushengagement to the base 54, or for elevation with respect thereto, viathe rotatable inward positioning of the outer dial collar 58 which inturn elevates the feet 74 and the adjustable ramps 70 above the rampsupports 72. The adjustable ramps 70 also preferably include a top shelf102, a forward tang 104, and a leading edge 106. The adjustable ramps 70also preferably include a rear arcuate edge 108. The rear arcuate edge108 is preferably adapted for positioning adjacent to the rear edge 110of the arcuate or kidney-shaped apertures 86 when the adjustable ramps70 are in flush alignment with the ramp supports 72 defining a firstposition. In this first position, each adjustable ramp 70 has theidentical shape of the corresponding ramp support 72 representing asmooth transition therebetween (FIG. 6). In this first position, theforward tang 104 is preferably positioned adjacent to and in contactwith the interior edge 112 of the arcuate or kidney-shaped apertures 86.It should be noted that the arcuate or kidney-shaped apertures 86 arepreferably oversized relative to the feet 74 of the adjustable ramps 70.

[0082] Each of the adjustable ramps 70 preferably has a second bushingface 186. (FIGS. 6 and 7). The second bushing face 186 is also arcuatelaterally and is simultaneously arcuate vertically, descending inwardlyand downwardly having a pre-selected shape from the top shelf 102 to theleading edge 106. The adjustable ramps 70 have their narrowest widthdimension proximate to the top shelf 102 and the largest width dimensionproximate to the leading edge 106. The shape selected for the adjustableramps 70 and second bushing faces 186 may have any rotational, curved,twisting, and/or spiral incline as desired for flush alignment with thefirst bushing face 184 when in the first position. The angle of inclinefor the adjustable ramps 70 may also vary between the portion of theadjustable ramps 70 adjacent to the leading edge 106 and the portion ofthe adjustable ramps 70 proximate to the top shelf 102. The angle ofincline for the adjustable ramps 70 may also be consistently uniform,regularly curved, or variable at the discretion of an individual. (FIGS.6, 7, 12A-12D). The adjustable ramps 70 may further have a relativelysmaller incremental increase or decrease in the angle of inclineadjacent to the leading edge 106. Also, the adjustable ramps 70 may havea larger or steeper incremental increase or decrease in the angle ofincline adjacent to the top shelf 102. The variable angle of incline forthe adjustable ramps 70 are preferably in addition to the arcuateinterior curve for the shape of each adjustable ramp 70 and secondbushing face 186.

[0083] As depicted in FIGS. 5 and 7, and as shown in phantom line inFIG. 3, as the outer dial collar 58 is rotated inwardly toward the base54, the contact between the outer dial collar 58 and the feet 74initiates the elevation of the adjustable ramps 70 relative to the rampsupports 72. As rotation of the outer dial collar 58 continuesadditional upward elevation of the adjustable ramps 70 occurs. Duringelevation; the feet 74 of the adjustable ramps 70 move forwardly andinwardly as represented by arrow 114 of FIG. 3 within the arcuateapertures 86. When the outer dial collar 58 is fully engaged forpositioning adjacent to the base 54, the adjustable ramps 70 and aremoved to a second fully engaged position where the second busing faces186 are elevated to a maximum point relative to first bushing faces 184.In this second fully engaged position, the forward tangs 104 arepositioned adjacent to the exterior edges 116 of the arcuate orkidney-shaped apertures 86. It should be noted that the forward tangs104 in the second fully engaged position are also preferably adjacent tothe front arcuate edges 118 of the arcuate or kidney-shaped apertures86. The elevation of the second bushing faces 186 relative to the firstbushing faces 184 is illustrated in FIG. 7. It should be noted that therotation of the outer dial collar 58 preferably simultaneously anduniformly moves all of the adjustable ramps 70 forwardly and upwardlywith respect to the first bushing surface 184 of the ramp supports 72.In this second fully engaged position, a less steep angle of incline isprovided for the adjustable ramps 70 relative to the ramp supports 72.

[0084] The feet 74 of the adjustable ramps 70 are preferably alsoarcuate or kidney-shaped for positioning within the arcuate orkidney-shaped apertures 86. The rotation of the outer dial collar 58toward the base 54 elevates the forward tangs 104 within the arcuate orkidney-shaped apertures 86.

[0085] Referring to FIG. 2, as the outer dial collar 58 is rotatedinwardly about the throat 56, the leading surface of the outer dialcollar 58 engages the first flat surfaces 76 of the feet 74. As furtherinward rotation of the outer dial collar 58 occurs, the feet 74 of theadjustable ramps 70 elevate. The contact between the feet 74 and outerdial collar 58 then progresses toward the transition point 80 as furtherrotation of the outer dial collar 58 occurs. Proximate to the transitionpoint 80, the adjustable ramps 70 are being elevated with respect to theramp supports 72. As further rotation of the outer dial collar 58occurs, the feet 74 are elevated beyond the transition point 80 onto thesecond inclined surface 78. At such time as the outer dial collar 58 iscompletely rotated to elevate the feet 74 and adjustable ramps 70 to themaximum level, the second inclined surfaces 78 will preferably be inflush contact with the outer dial collar 58.

[0086] It should be noted that inward rotation of outer dial collar 58causes all of the feet 74 to elevate simultaneously and equally.Therefore, all of the inclines for the adjustable ramps 70 are identicaland are elevated or lowered by a corresponding uniform amount.

[0087] Each of the adjustable ramps 70 preferably include asubstantially triangular shaped horizontal shelf 120 which is preferablypositioned exterior to the forward tangs 104 underneath the leadingedges 106. The triangular shaped horizontal shelves 120 flushly engagethe base 54 which function as a stop to align the adjustable ramps 70 tothe ramp supports 72 when the adjustable ramps 70 are in the firstnon-elevated position.

[0088] As depicted in FIG. 7, the outer dial collar 58 is preferablyrotated for elevation of the adjustable ramps 70 to the second fullyelevated position where the outer dial collar 58 is engaged to thesecond inclined surfaces 78 of the feet 74. The outer dial collar 58 maybe rotated for elevation of the adjustable ramps 70 to any desiredposition between the first lowered position and the second fully engagedposition as desired by an individual. An infinite variety of positionsis available for elevation of the adjustable ramps 70 above the rampsupports 72 as desired by an individual.

[0089] Referring to FIGS. 3 and 6, the top shelves 102 of the adjustableramps 70 and top shelves 92 of the ramp supports 72 each include alignedapertures 68 therethrough. Preferably a nut and bolt, pin, or screw 94pivotally attaches the adjustable ramps 70 to the ramp supports 72proximate to the top shelves 102 and 92 respectively. The apertures 68through each of the top shelves 102 and 92 each preferably have abushing 182 to reduce friction between the pin or screw 94 and theapertures 68.

[0090] Referring to FIG. 8, the ramp supports 72 and outer dial collar58 are depicted in cross section. The ramp supports 72 are shown to bein flush contact with the adjustable ramps 70. As is apparent in FIG. 8,the straight interior edge 98 of each helix ramp 72 is in flushengagement to the straight adjacent wall and edge 100 of an adjacentadjustable ramp 70. The oversizing of the arcuate or kidney-shapedapertures 86 is apparent relative to the feet 74 of the adjustable ramps70. The outer dial collar 58 is shown to be threadably engaged to thethroat 56. The outer dial collar 58 may be secured in a desired locationrelative to the throat 56 by the tightening of a set screw 122. Itshould be noted that the set screw 122 is preferably engaged to thenon-threaded surface 132. However, the set screw 122 may be engaged tothe threaded portion 57 of the throat 56 when a nylon or rubber insertis utilized to avoid causing damage to the threads 57 of the throat 56.Alternatively, the set screw 122 may be adapted for tighteningengagement to the throat 56 at a location where threads are absent. Thebase 54 of the adjustable ramp helix 10 also preferably includes acentral collar 124 defining an opening 126 adapted to receive a shaft(not shown).

[0091] Referring to FIG. 6, it should be noted that the inner walls 128of the adjustable ramps 70 are preferably arcuate and are substantiallyparallel to the arcuate exterior edges 96 of the ramp supports 72.

[0092] Referring to FIG. 5, the driven or secondary clutch 12 isdepicted during an open throttle condition where the sheaves 16 havebeen moved outwardly according to arrow 30. During open throttleconditions, the spring 50 is compressed due to the outward movement ofthe sheaves 16 in response to the drawing of the V-belt 18 toward thecenter of the sheaves 16. In this instance, the bushings 32 are movedoutwardly and upwardly along the adjustable ramps 70 to facilitateshifting of the transmission of the snowmobile 14. The outer dial collar58 in this figure is shown to be in engagement with the feet 74 of theadjustable ramps 70. Also shown in FIG. 5 is the affixation of theadjustable ramp helix 10 to the driven or secondary clutch 12 via theengagement of the nuts 44 to the threaded posts 42.

[0093] In an alternative embodiment the adjustable ramp helix 10 may beengaged to the opposite or internal side of the driven or secondaryclutch 12. One embodiment showing engagement to the clutch 12 proximateto the engine 24 is depicted in FIGS. 9 and 11. In this embodiment, theadjustable ramp helix 10 is positioned interior to the driven orsecondary clutch 12 adjacent or proximate to the engine 24 below theclutch and belt guard 26 of the snowmobile 14. The adjustable ramp helix10 may be engaged to the driven or secondary clutch 12 proximate to oraway from the engine 24 depending on the make of vehicle and type ofclutch 12 utilized.

[0094] As depicted in FIG. 11, the base 140 includes three regularlyspaced, sized, and ramp supports 72. Each ramp support 72 preferablyincludes a top shelf 144 and an aperture 146 to facilitate pivotalaffixation of an adjustable ramp 148 thereto. Each aperture 146 ispreferably adapted to hold a bushing 182 and a nut and bolt, set screwand/or pin connector as earlier described. The base 140 preferablyincludes a central collar 150. Each ramp support 72 preferably includesa substantially vertical channel 152 which is adapted to receive asubstantially vertical tongue 154 which is integral to each adjustableramp 148. The adjustable ramps 148 preferably include a bushing face 156which is substantially T-shaped relative to the vertical tongue 154.

[0095] In this embodiment, the ramp supports 72 include an arcuateexterior wall 158. Each ramp support 72 is adapted to receive the tongue154 of an adjacent adjustable ramp 148.

[0096] In this embodiment, three elevator apertures 162 verticallytraverses the base 140. The vertical elevator apertures 162 arepreferably adapted to each receive an elevator pin 164. The elevatorpins 164 preferably extend below the base 140 and are adapted forengagement to an elevator or outer dial collar 58. Elevation of theelevator, or rotation of the outer dial collar 58, engages the elevatorpins 164 to urge the elevator pins 164 upwardly for engagement to arespective tongue 154 to elevate the adjustable ramps 148 relative tothe ramp supports 72.

[0097] Referring to FIG. 9, the alternative adjustable ramp helix 10 isshown engaged to the driven or secondary clutch 12. The alternativeadjustable ramp helix 10 is shown to surround a shaft 130. Theadjustable ramp helix 10 includes a throat 56 and an outer dial collar58 as earlier described. The throat 56 may include an non-threadedsurface 132 as earlier described. The outer dial collar 58 preferablyraises or lowers the elevator pins 164 to either raise or lower thebushing faces 156 to desired angle of incline to assist the transmissionof a snowmobile 14 during shifting. Referring to FIG. 9, as the V-belt18 is drawn downwardly, the sheaves 16 separate, which in turn resultsin the bushings 32 ascending upwardly along a respective bushing face156. It should be noted that the bushings 32 do not engage or ride uponthe ramp supports 72 even when the adjustable ramps 70 are at the lowestfirst position. The bushings 32 preferably engage the adjustable ramps70 during use of the adjustable helix 10. The angle of incline selectedfor the bushing faces 156 determines the speed of shifting for thetransmission of the snowmobile 14.

[0098] Referring back to FIG. 11, it should be noted that therelationship between the vertical tongues 154 and the bushing face 156may be substantially an inverted L-shape as opposed to a T-shape at thediscretion of an individual without affecting the essential functions,features, and attributes described herein.

[0099] Referring to FIG. 10, the vertical channels 152 are preferablyoversized with respect to the vertical tongues 154 to permit the pivotalelevation of the vertical tongues 154 relative to the ramp supports 72via a nut and bolt, pin or set screw as positioned within the apertures146. Each vertical tongue 154 may include an angled base portion 166 tofacilitate engagement interior to a respective ramp support 142 asadjacent to the arcuate exterior wall 158.

[0100] Referring to FIGS. 9, 10, and 11, as the outer dial collar 58 isrotated inwardly about the throat 56, the leading surface of the outerdial collar 58 engages the elevator pins 164. As further rotation of theouter dial collar 58 occurs, the elevator pins 164 elevate for contactwith either the T-supports 163 or vertical tongues 154. The contactbetween the elevator pins 164 and the outer dial collar 58 in turnelevates the adjustable ramps 148 and bushing faces 156 upwardlyrelative to the ramp supports 72. As further rotation of the outer dialcollar 58 occurs, the elevator pins 164 continue to progress upwardly.At such time as the outer dial collar 58 is completely rotated toelevate the elevator pins 164 to the maximum level, the adjustable ramps148 and bushing faces 156 will be positioned to establish the lowestangle of incline available to a user for shifting of a snowmobiletransmission.

[0101] As depicted in FIGS. 12A-12D, the angle of incline for the rampsupports 72, adjustable ramps 70, or bushing faces 156 may be variableat the discretion of an individual. A variable ramp is one which doesnot include a uniform or arcuate transition between a top portionproximate to the top shelf and the base. As depicted in FIG. 12B, avariable ramp would include a first flat or angled portion proximate toa base and a second steeper angled portion proximate to a top shelf.

[0102] In an alternative embodiment, the elevator 58 may individuallyraise or lower the adjustable ramps 70 consecutively to an equal desiredangle of incline relative to the bushings 32. In this embodiment theelevator 58 is not required to simultaneously raise all the adjustableramps 70. However, it should be noted that the elevator 58 is requiredto raise all of the adjustable ramps 70 to an exact level to avoiduneven wear on the bushings 32 and clutch 12. In this embodiment thetransition members 73 may be either a foot 74 or an elevator pin 164 aspreferred by an individual.

[0103] The elevator 58 may be used to either raise or lower theadjustable ramps 70 relative to the ramp supports 72. In an alternativeembodiment, the adjustable ramps 70 may be initially set in the second,most elevated position, where the elevator 58 may be manipulated tolower the adjustable ramps 70 to provide a desired angle of incline. Inthis embodiment a return, spring, or actuating member may be provided toautomatically position the adjustable ramps 70 to the second elevatedposition upon the release of the elevator 58. In an alternativeembodiment, a return, spring, and/or actuating member may be utilized toautomatically position the adjustable ramps 70 to the lowered firstposition upon the release of the elevator 58. In another alternativeembodiment the elevator 58 may be required to be manipulated to eitherraise or to lower the adjustable ramps 70 to an angle of incline aspreferred by an individual.

[0104] An alternative embodiment is depicted in FIGS. 13 and 14. In thisembodiment, the adjustable ramps 202 are pivotally engaged to the rampsupports 204 which extend outwardly from the base 200. The base 200includes a central throat 206 which may be adapted to surround a shaftof the snowmobile 14. The exterior surface of the central throat 206 mayeither be threaded or non-threaded at the preference of an individual.

[0105] A plurality of first pins 208 preferably function as thetransition members 73 passing through apertures 86 traversing the base200. The first pins 208 are preferably positioned between the adjustableramps 202 and the elevator platform 210.

[0106] The base 200 has an exterior wall 212 defining an internal cavity214. The interior of the cavity 214 is preferably threaded as identifiedby numeral 216. The elevator platform 210 preferably has a centralopening for surrounding the shaft or central throat 206. The elevatorplatform 210 has a distal circumferential end 218 which is preferablythreaded and is adapted to rotatably engage the threaded cavity 216. Theelevator platform 210 is preferably adapted to be freely rotatablewithin the interior of the cavity 214. The elevator platform 210 alsopreferably includes a plurality of holes 220 therethrough. The elevatorplatform 210 has a first engagement surface 222 which is preferablyadapted for contact with the first pins 208 which in turn are used toelevate the adjustable ramps 202 with respect to the ramp supports 204.The first engagement surface 222 is preferably smooth and may be coatedwith a friction reducing material to facilitate the circular or arcuatecontact with the first pins 208 during rotation of the elevator platform210.

[0107] An outer collar 224 is preferably rotatably engaged to theexterior of the wall 212. The outer collar 224 preferably has aplurality of securely affixed rotational pins 226 extending inwardlyinto the cavity 214. Each of the rotational pins 226 is preferablyadapted for positioning through one of the holes 220. Rotation of theouter collar 224 thereby transfers rotational motion from the outercollar 224 to the elevator platform 210 through the rotational pins 226.The rotational pins 226 preferably slide through the holes 220 which maybe coated with a friction reducing material at the preference of anindividual. The rotation of the elevator platform 210 in turn causes thefirst pins 208 to elevate or lower the adjustable ramps 202. Theexterior surface of the outer collar 224 may be knurled 180 at thepreference of an individual to facilitate grasping and manipulationthereof. The outer collar 224 may be rotatably engaged to the exteriorwall 212 through the use of a rail and pin 228 which may include ballbearings to facilitate positioning of the outer collar 224 relative tothe base 200.

[0108] The exterior wall 212 may include a positioning cavity 230adapted to hold a spring 232 and detente ball 234. The interior of theouter collar 224 may also include a track 236 having a plurality ofpositioning recesses 168 as depicted in FIG. 14.

[0109] A travel limiter 238 may traverse the outer collar 224 forengagement to the exterior wall 212 to restrict rotation of the outercollar 224 relative to the exterior wall 212 at the discretion of anindividual.

[0110] The spring 232 and detente ball 234 are preferably adapted foradjustable positioning within the track 236. The detente ball 234 ispreferably seated within one of the plurality of positioning recesses168 to assist in the retention of the outer collar 224 in a desiredposition relative to the base 200 to provide a desired level ofelevation or incline for the adjustable ramps 202. The first pins 208freely slide upon the first engagement surface 222 in a circularconfiguration when viewed from above. The rotational pins 226 freelyslide within the holes 220 to permit movement of the elevator platform210 inwardly toward or outwardly away from the adjustable ramps 202. Thefirst pins 208 and the rotational pins 226 are preferably offset withrespect to each other to avoid contact, which could interfere with thefree rotation of the elevator platform 210 within the cavity 214.

[0111] The adjustable ramp helix 10 may also be either electronicallyand/or hydraulically coupled to a power source such as a motor or pumpto engage the elevator 58 to eliminate the necessity for manualmanipulation. In this embodiment, the vehicle may include a switchadjacent to a handlebar and/or steering column which may be activated byan individual. The engagement of the switch in turn preferably providesa signal to the motor or pump to initiate movement of the elevator 58for elevation or lowering of the adjustable ramps 70.

[0112] A vehicle may further include a temperature censor and/oraltimeter, or the vehicle may include an input device where anindividual may enter data such as altitude, temperature, and/or snow orenvironmental conditions. The censors and/or input device may be incommunication with a microprocessor which in turn may process the dataand automatically communicate a signal to the motor or pump to elevateor lower the elevator 58 to an optimal angle of incline for theadjustable ramps 70.

[0113] It should be further noted that the use of an adjustable ramphelix 10 as described herein may be adapted for use with four-wheelall-terrain vehicles, watercraft, or automobiles via the use ofhydraulic assists and servo motors as connected to a controller andcomputer to sense environmental conditions for signaling of requiredtransmission adjustments to manipulate the adjustable ramp helix 10.

[0114] The present invention may be embodied in other specific formswithout departing from the spirit or essential attributes thereof; andit is, therefore, desired that the present embodiment be considered inall respects as illustrative and not restrictive, reference being madeto the appended claims rather than to the foregoing description toindicate the scope of the invention.

I claim:
 1. An adjustable ramp helix comprising: a. a base having aplurality of vertically adjustable ramps; and b. an elevator operativelyconnected to said adjustable ramps, whereby said elevator simultaneouslyalters the elevation of said adjustable ramps relative to said base. 2.The adjustable ramp helix according to claim 1, said base furthercomprising a plurality of apertures.
 3. The adjustable ramp helixaccording to claim 2, further comprising a transition member positionedbetween the elevator and the adjustable ramps, wherein movement of saidelevator toward said base elevates said adjustable ramps.
 4. Theadjustable ramp helix according to claim 2, further comprising atransition member positioned between the elevator and the adjustableramps, wherein movement of said elevator away from said base lowers saidadjustable ramps.
 5. The adjustable ramp helix according to claim 3,said transition member comprising: a foot engaged to each of saidadjustable ramps, each of said feet adapted for positioning within oneof said apertures.
 6. The adjustable ramp helix according to claim 3,said transition member comprising an elevator pin positioned within eachof said apertures.
 7. The adjustable ramp helix according to claim 5,said base further comprising a throat.
 8. The adjustable ramp helixaccording to claim 7, said elevator comprising a collar at leastpartially surrounding said throat, said collar moveable relative to saidthroat whereby positioning of said collar elevates said adjustable rampsrelative to said base.
 9. The adjustable ramp helix according to claim7, said elevator comprising a collar at least partially surrounding saidthroat, said collar moveable relative to said throat whereby positioningof said collar lowers said adjustable ramps relative to said base. 10.The adjustable ramp helix according to claim 8, said base furthercomprising: a plurality of ramp supports, wherein each adjustable rampis engaged to one of said ramp supports.
 11. The adjustable ramp helixaccording to claim 10, wherein said adjustable ramps are pivotallyengaged to said ramp supports.
 12. The adjustable ramp helix accordingto claim 8, said throat comprising a threaded section, said collarrotatably engaged to said threaded section wherein rotation of saidcollar toward said base elevates said adjustable ramps.
 13. Theadjustable ramp support according to claim 8, said throat comprising athreaded section, said collar rotatably engaged to said threaded sectionwherein rotation of said collar away from said base lowers saidadjustable ramps.
 14. The adjustable ramp helix according to claim 6,said base further comprising a throat.
 15. The adjustable ramp helixaccording to claim 14, said elevator comprising a collar at leastpartially surrounding said throat, said collar moveable relative to saidthroat whereby movement of said collar elevates said adjustable ramps.16. The adjustable ramp helix according to claim 14, said elevatorcomprising a collar at least partially surrounding said throat, saidcollar moveable relative to said throat whereby movement of said collarlowers said adjustable ramps.
 17. The adjustable ramp helix according toclaim 16, said throat comprising a threaded section, said collarrotatably engaged to said threaded section wherein rotation of saidcollar towards said base elevates said adjustable ramps.
 18. Theadjustable ramp helix according to claim 16, said throat comprising athreaded section, said collar rotatably engaged to said threaded sectionwherein rotation of said collar away from said base lowers saidadjustable ramps.
 19. An adjustable ramp helix comprising: a. a basehaving a plurality of ramp supports an adjustable ramp engaged to eachramp support, and a plurality of apertures traversing the base, each ofsaid adjustable ramps having a foot adapted for positioning within oneof said apertures and an arcuate vertically and arcuate laterallybushing face, said base further having a throat having a threadedsection; and b. An elevator comprising a collar rotatably connected tosaid threaded section, said collar in contact with said feet, saidcollar adapted for rotation with respect to said throat to alter theelevation of said adjustable ramps relative to said base, said elevatorfurther comprising a positioner said positioner adapted to restrictrotation of said collar relative to said throat.
 20. An adjustable ramphelix comprising: a. a base having a plurality of ramp supports, anadjustable ramp engaged to each ramp support, and a plurality ofapertures traversing the base, each of said adjustable ramps having apin adapted for positioning within one of said apertures and an arcuatevertically and arcuate laterally bushing face, said base further havinga throat having a threaded section; and b. An elevator comprising acollar rotatably connected to said threaded section, said collar incontact with said pins, said collar adapted for rotation with respect tosaid throat to alter the elevation of said adjustable ramps relative tosaid base, said elevator further comprising a positioner, saidpositioner adapted to restrict rotation of said collar relative to saidthroat.